Core-oven.



J. J.'JOHNSON.

i GORE OVEN.

APPLICATION FILED 11315.26, 1909.

2 SHEETS-SHEET 1.

J. J. JOHNSON.

CORE OVEN.

APPLICATION FILED FBB.26, 1909.

Patented 0011.5, 1909.

2 SHEETS-SHEET 2.

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'UNITED STATES PATENT OFFTCE.

JOSEPH J. JOHNSON, OF NEWARK, NEW JERSEY.

CORE-OVEN.

To all whom it may concern:

Be it known that I, JOSEPH J. JOHNSON, a citizen of the United States,and a resident of Newark, in the county oi Essex and State of NewJersey, have invented a new and Improved Core-Oven, of which thefollowing is a full, clear, and exact description.

This invention relates to ovens, and particularly to core ovens whichare used for drying or baking cores used in molding.

The object of the invention is to produce an oven oi this class whichwill be simple in construction, the temperature of which can be nicelyregulated, and which will have a construction which will enable the ovento be kept constantly iilled.

More speciiically the invention contemplates the use of a plurality ofshelves which extend across the interior of the oven so as to supportcores which are drying, and these shelves project at the sides of theoven so as to receive green cores which are to be dried or baked. lVhenthe cores on the interior are completely dried or baked, the shelves areadvanced so that the green cores pass into the interior oi' the oven,while the baked cores pass out of the oven at the other side. In thisway cores can be quickly removed without the loss oi a substantialamount of heat, and the output of an oven oi' certain capacity isgreatly increased.

A further object oi the invention is to construct the oven in such a wayas to control the circulation oi the gases of combustion, and to providea more direct outlet for the gases, which is to be used to give anincreased drait when the fire is being started.

The invention consists in the construction and combination of parts tobe more fully described hereinafter and particularly set forth in theclaims.

Reference is to be had to the accompanying drawings forming a part ofthis speciiication, in which similar characters of reierence indicatecorresponding parts in all the figures. Figure 1 is a verticallongitudinal section through an oven constructed according to myinvention; Fig. 2 is a side elevation oi a portion .of the interior ofthe oven, and iurther illustrating its construction; Fig. 3 is avertical cross section through the oven taken substantially on the line3 3 of Fig. l; and Fig.,4 is a plan showing one of the shelves, onecorner being broken away.

Referring more particularly to the parts,

Specification of Letters Patent.

Application filed February 26, 1909.

Patented Oct. 5, 1909. Serial No. 480,173.

1 represents the body or case of the oven, which is of box form andconstructed of iron. This body is elongated so that it is rectangular inplan, and in one end on the bottom 2 of the oven, there is provided aiire pot 3 having a grate 4 upon which a iire may be built. This iirepot is built of fire brick, or similar material, and is provided withcorner posts 5 which support a cover 6. The gases of combustion escapefrom the fire pot between the posts and around the edges of the cover 6,-as will be readily understood. Near the middle point of the body it isprovided with a transverse main baiile or baiiie wall 7. This wallextends from the bottoni 2 to a point near the cover 8 of the body. Nearthe upper edge of the iire pot, the bailie 7 is provided with a draftopening 9 which is closed by a damper door 10 attached by a hingeconnection 11, and operated by means of a crank l2 on the exterior ofthe body, as indicated in Fig. 3. The cover 8 is an outer cover, andbeneath this cover .S there is an inner or under cover 13 which consistsoi a horizontal plate extending completely across the interior of thebody, and extending from the end wall 14 adjacent to the lire pol towardthe end wall 15 remote from the fire pot. The cover S is provided withan Opening near the wall lst, at which a stack 16 is attached. Underthis stack 16 an opening 17 is formed in the inner cover 13, and thisopening 17 is adapted to be closed or partially closed by a slidingdamper 18, the handle 19 oi which projects out through the end wall 14of the body. The inner cover' 13 does not reach to the end wall 15, andat its extremity it is connected to a downwardly extending end baiile orbaille wall 20 which lies near the wall 15. The wall 2() extends to apoint near the bottom 2. ln this way a vertical duct 2l is formed forthe gases of combustion near the end wall l5 remote from the iire pot,and the upper extremity of this duct 21 communicates with a duct 22which is formed between the inner cover 13 and the outer cover 8. Thisduct leads the gases to the stack or stove pipe 16. The sides of theoven are provided with a plurality of rectangular openings 23, and theseopenings are preferably arranged in pairs so that there are two openingson each side at the same level. In the illustration I have shown four ofthese pairs of openings on each side. Near the lower edges oi` theseopenings, angle brackets 24 are attached, the bodies of which projecthorizontally from the sides, as indicated in Fig. 3. Adjacent to theseangle brackets, doors 25 are provided which are attached by hingeconnections 26. On the adjacent faces of the baffle walls, and on theinner face of the end Wall 14, guide cleats 27 and 28 are provided.These guide cleats are arranged in pairs. The guide cleats 27 areprovided with anti-friction rollers 29, having gudg'eons 30 which run inlongitudinal grooves 31 formed 'in the cleats, as shown. The cleats 28are provided with depressed faces or recesses 32 which receive gudgeo'ns33 of similar anti-friction rollers 34. These antifiiction rollers 34have V-shaped faces 35 which receive Vthe V -shaped grooves 3G whichareformed in edge rails 37 formed on shelves 3S. These shelves are adaptedto receive the cores, and they are formed of gratings, as indicated inFig. 4. Each shelf is of, rectangular form and of a length substantiallytwice the width of the oven. Each shelf is provided with a verticallyextending web 39 which has substantially the same dimensions as theopenings 23 in the sides o'f the oven. rIhe side edges of the shelvesare received between the rollers 29 and 34,

as indicated in Fig. 1, the shelves being in- 30 serted at the doors 25.The shelves normally have an alternate arrangement, as indicated in Fig.3, so -that adjacent shelves project at opposite sides of the oven. Onthe side where the shelf projects from the oven, the door 25 is let downso that it rests upon adjacent angle@ brackets 24. At this time thevertical web 39 of the bracket is disposed at the opening 23 in the wallwhich is produced by opening the door, so that the 40 shelf itself formsa clo'sure'at this point.

In operating the oven, the melders stand on opposite sides and operatethe shelves. Then the cores on a certain shelf have been baked, theshelf is slid longitudinally on the rollers so that the part of theshelf which has been within the oven projects from the oven, and thepart which has been projecting from the oven moves into the interior ofthe oven. In this way the baked coresare carried out of the oven intoreach of the attendant, who removes the baked cores 'and places greencores on the projecting part'of the shelf. On the side of the ovenopposite tothe projecting shelf, the doors -25 'are'held closed bysuitable catches 40. The outersides of the doors are provided withsuitable handles 41 forxraising and lowering them. IViththis'arrangement it should'be understood that the webs of the shelvesefectually close the opening when the door is let down for a shelf toproject. `The'movement of removing the baked cores :also "advances theunbaked :cores into the oven, vsothatthereis no opportunity foravsubstantial loss of heat from the oven in this operation. Indeed, itshould appear that the Ioven is in continuous operation up toitsl fullcapacity at every moment.

Referring to Fig. 1, the normal course of the gases of combustion isindicated by the arrows. These gases pass up through the slots in theshelves, the principal portion of the gases passing up directly over thefire pot so as to pass over the upper edge of the main baflie 7descending -on the right side 75 of this battle so as to pass under thelower edgeof the ba'flie 20. kThe gases then pass up through the duct21, through the duct 22, and to the stack 16.

The compartment which is formed in the body bythe baffle 7, directlyover the fire pot may be considered as the first compartn'ient where theheat will tend to be greatest, while the compartment at the right of thebaffle 7 may be considered'as the second com- 85 partment. If thetemperature in the second compartment 'should tend to be low, it ymay beraised by opening or partially opening the damper door 10 sothat some ofthe gases of combustion will pass into it directly from the fire pot.v'It should be understood that the damper 18 is normally closed. Instarting up the 'fire in order to give a more direct route for the gasesof combustion, and to obviate the necessity of the circuitous pathdescribed through the oven, the damper 1S should be opened and thedamper 10 closed; the gases will vthen pass from -the iire pot 3directly vertically through the opening 17 to thestack 16.

The lower Aportion of the second compartment on the bottom 2, may beutilized to bake cores which require a longer time than usual, andaccess may be had to this compartment through a side door 42, as shownin Fig. 1. In order togive increased width to the shelves, their edgesvextend beyond 'the edges of the openings 23, as indicated in Fig. 2,r sothat when the shelves are withdrawn into the interior, short slots 43are 110 formed vin the sides near the closed doors 25, but these slots,it will be observed, are

substantially closed by the ends of the shelves which lie adjacent tothem, 4as will appear from an inspection of Fig. 3.

Having thus described my invention, I claim as new and desire to secureby Letters Patent,-

1. In an oven of the class described, in combination, a body havingoppositely disposed openingsk on the sides thereof, shelves mounted toslide in said body having webs on the interior of said body adapted toclose said openings, brackets attached to said body on the outer sidethereof-adjacent the lower edges of said openings, and swinging doorsnormally fclosing said openings and adapted to swing down to ahorizontal-position restingon said brackets,v said doors being adaptedin their horizontal position to support the projecting parts of saidshelves, said shelves being of substantially twice the width of saidbody.

2. In a core drying oven of the class described, in combination, a bodyhaving a fire pot therein, a main baiiie wall mounted in said body anddividing the interior thereof into compartments, said baffle wall havingan opening therethrough through which gases of combustion may passdirectly over said fire pot through the compartment remote therefrom,and a plurality of shelves mounted in said body and adapted to receivethe cores.

3. In an oven of the class described, in combination, a body having afire pot therein, a substantially vertical battle wall adjacent to saidfire pot and dividing the interior of said body into a first compartmentover said lire pot and a second compartment beyond said fire pot, saidbaffle affording means for normally guiding the gases of combustion fromthe fire pot, through said first compartment and then through saidsecond compartment, said baffle wall having an opening therethrough adjacentto said lire pot which may admit gases of combustion directly fromsaid fire pot through said second compartment, and a damper forregulating the flow of gases through said opening.

4. In an oven of the class described, in combination, an elongated bodyof substantially rectangular form, a fire pot mounted in said body nearone end thereof, a verti cally extending main baffle adjacent to saidfire pot and dividing said body into a first compartment over said tirepot and a second compartment beyond said fire pot, a second batiieextending downwardly from the upper portion of said body, said baiiiebeing arranged so that the gases of combustion pass over the edge ofsaid first baffle and under the edge of said second baflie, and aplurality of shelyes secured in said body and adapted to receive cores.

5. An oven of the class described, having an elongated substantiallyrectangular body, a fire pot mounted in said body at one end thereof, amain baffle extending upwardly adjacent to said fire pot and dividingthe interior of said body into a first compartment over said fire potand a second compartment beyond said fire pot, said main baffle beingarranged so that the gases of combustion passing up through said firstcompartment will pass over the upper edge thereof and downwardly throughsaid second compartment, and a second baffle extending downwardly fromthe upper portion of said body to a point near the bottom thereof andadapted to have the gases pass under the lower edge thereof, said secondbafie forming a duct with an end wall of said body remote from said firepot to conduct the gases upwardly, said body having a second duct formednear the cover thereof communicating with said first duct and having anexit opening communicating with said second duct.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOSEPH J. JOHNSON.

IVitnesses F. D. AMMEN, EVERARD B. MARSHALL.

